Rotary machine



Dec. 3l, 1935. E. sElBoLD'Er Al.

ROTARY MACHINE Filed May 18, 1954 2 Sheets-Sheet l INVENTORS ErfzfJezo/d 'Dc-2c. 31, 1935. E 5E|BOLD ET AL 2,025,959

ROTARY MACHINE Filed May 18, 1934 2 Sheets-Sheet 2 l I l A z Nl y (nifler @vou/1J ry I Patented Dec. 3l, 1935 UNITED STATES PATE-'N'l 'OFFICE AROTARY MACHINE Ernst Seibold and Georg HopfensbergenHeidenheim-on-the-Brenz, Germany 'Application May 1s, 1934, serial310,126,212 In Germany May 18, 1933 4Clalms.

5 ticular the invention refers to the design of theA control cylinder ofsuch machine.

As naturally -diierent pressures are exerted upon the circumference ofthe control cylinder, according to the difference of pressure in thesuction and outlet zones, the sealing of the control cylinder withrespect to the rotor presents considerable diiliculties in practice,especially when a matter of high outlet pressures is concerned. This andother dimculties are advantageously removed by the invention.

' In the accompanying drawingsf- Figure 1 is a sectional view of a rotorhaving our improvements embodied therein;

Figure 2 is a similar section of the same part,'

surrounded however by van outer rotor; and y Figure 3 is a longitudinalsection taken on line 3 3 of Figure 2.

Similar characters of reference indicate corre-A connected to anexterior stationary machine part and can simultaneously, wholly orpartly, serve for supporting rotor B. Opposite to a1 and radiallymovable is arranged the pressure side part a2 so that, from thestationary part a1, a2 can be pressed against the rotor by suitablemeans in the pressine zone. 'I'he clearance between parts a1 and a2 isclosed by an elastic packing C. Pressing oi the movable part a2 fromstationary part a1 can according to the invention be 40 made bymechanical means.vas springs, wedges, cams or a combination o! suchmeans with each other. In particular it is also possible to use for thispurpose the pressure of the compressed gas itself. As between the twocontrol cylinder parts a1 and a2 the highest end pressure of thecompressed medium prevails. This is admitted through the control slota3. The inside chamber formed between the parts a1 and a2 thereby has anoverpressure which will press the control cylinder against the rotor.The last arrangement is especially advantageous, because for varying endpressures the pressing force between cylinder part a1 and rotorautomatically adapts itself to the prevailing end pressure. Thus nounnecessary friction making lubrication difficulties is produced at lowend pressure as is the case with mechanical pressing devices.` Existingdifflculties of lubrication may be met by advantageously using as aconstant lubricant for the lubrication of the sliding surfaces betweenthe con- 5 trol cylinder and the rotor, an auxiliary liquid, separatedfrom the compressed medium and taken along by it in its movement.

Referring to the drawings, the inner rotor B has a plurality of vanesI0, which have their in- 10 ner ends contact with the two parts alianda, and rotate about the Isame. It is important to bringabout a snug fitbetween the inner ends of the vanes III and the compression part` a2 toavoid leakage of the compressed fluid, as air or l5 the like, andthissnug fit is obtained by the action of the springs a4, acting upon thepart a. which -springs are` of any suitable type, such as a helicalspring, having their opposed ends seated in opposed recesses I3 and I4.These springs zo serve to press the part a2 against the inner ends I2 ofthe vanes I6. A

About the free ends of the vanes III, the outer rotor I5 has ridges I6and grooves or valleys I1, of a number, one more than the number ofvanes; 25 and this outer rotor I5 is surrounded by a casing I8. Theouter rotor I5 with its casing I8 rotates in the direction of the arrowI9.

The rotors as described have a shaft 28, to which the casing I8 isrigidly connected as shown'30 by 2|', and which shaft is supported bytwo supports 22 and 23, each having suitable bearings 24. A drive Wheel24B for power transmission is keyed to the shaft 28. Asthe shaft 28 `isrotated, the casing I8. and the outer rotor I5, being flxedly 35positioned therein, are rotated, and thereby the inner rotor is rotated,and the incoming air or the like, enters as shown by the arrow 25, in achannel 26 of the pipe 21, into the spaces 28 be# tween the vanes III,by means of the openings 29 40 of part a1. The rotation lof the innerrotor I0, causes these spaces 28 to be brought into a positioncorresponding to the compression position, and thereby the air or thelike is compressed, when in such spaces, now indicated by 281; and 45when space 281 is opposite to the opening a3 of the part a2, then thecompressed airV or the like enters the channel 30, and passes throughthe pipe 21, as indicated by the arrow. 8|. l

The pipe 21 has an extension 34 rigidly con- 50 nected to it with .astuiling box or seal 35, between it and the cover I8l of the casing I8,and another extension member 36, surrounded by a sleeve bearing 31between it and the casing I8. 'Ihe pipe 21 is suitably supported and itin ,turn

supports the parts a1 and a by means of the flange connection 211.

'I'he vanes I0 and webs ll and l! of the inner rotor form therein aplurality of substantially radial recesses 28, which converge towardsthe center of the rotor. The outer rotor substantially forms a closurefor the open sides of the recesses of the inner rotor, thus formingbetween the two rotors a plurality of chambers or compartments. As theapparatus is rotated, these compartmentsmove in an eccentric motionabout the axis of the shaft. Due to the eccentric relation of the innerrotor to the outer rotor, the surface of the outer rotor boundingeach'chamber moves inwardly relative to the outer walls of the chambertoward the axis of the shaft during one-half of each revolution, andoutwardly again during the remainder of the revolution. The eect of thisis to alternately increase and decrease the volume of each of thechambers 28. For example, in Figure 2, the uppermost chamber is atsubstantially minimum volume and the lowermost chamber is atsubstantially maximum volume. It will be seen that when a given chamberis at its eccentric position nearest the center of the shaft, a grooveor valley i1 forms its outer wall and that when the same chamber is atits eccentric position farthest from the axis of the shaft, a ridge i6forms its outer wall.

In operation, the apparatus preferably carries a certain amount ofliquid such as a suitable oil or water, which is contained' in thechambers. As the inner and outer rotors rotate together, this oil isthrown outwardly by centrifugal force against the inner surface of theouter rotor. This oil acts as a seal between the inner and outeryrotors. The amount of oil carried by each chamber only partly fills thechamber, the remaining portion thereof nearest the axis of rotationbeing occupied by the gas or other fluid which is to be compressed.

It will have been noted that as is well known to this art, the innerrotor is continually in driving engagement with the outerl rotor throughthe vanes engaging the side surfaces of the ridges and this is aslipping drive, the outer rotor slipping baekwardly relative to theinner rotor to the extent of one ridge during each rotation, and thedrive being progressively carried by different vanes.

As hereinbefore stated, the particular improvement of this inventionresides in the parts a1 and a2 cooperating in the manner described.

While there has been shown an embodiment of .our invention, it isnevertheless to be understood that the same is susceptible of moreorless modification as to the various details thereof, and we accordinglyreserve the privilege of resorting to all such legitimate changestherein as may be fairly incorporated within the spirit and scope oftheappended claims.

We claim:

1. In a rotary machine having inner and outer rotors eccentricallydisposed, said inner rotor having bladesforming spaces for auxiliaryfluid and air or gases, a control cylinder at the inner ends of theblades of the inner rotor, divided in its circumferential portion in twoparts, one of said parts being for the inlet of the air or gases to becompressed, and being stationary with respect to a part of the rotarymachine, the other part being of annular shape.' adapted to contactagainst a plurality of inner parts of the blades and .movably disposedagainst said blades of the inner lrotor, and having an opening for theoutlet of compressed air or gas coming from the spaces between theblades of the inner rotor.

2. In a rotary machine having inner and outer rotors eccentricallydisposed, said inner rotor havving blades forming spaces for auxiliaryfluid and air or gases, a control cylinder at the inner ends of theblades of the inner rotor, divided in its circumferential portion in twoparts, one of said parts being for the inlet of the air or gases to becompressed, and being stationary with respect to a part of the rotarymachine. the other partv being of annular shape, adapted to contactagainst a plurality of inner parts of the blades and movably disposedagainst said blades of the inn'er rotor, and having an opening for theoutlet of compressed air or gas coming from the spaces between theblades of the inner rotor, and means including the compressed air orgases coming from the spaces between the blades of the inner rotor forpressing said movable part against the innermost parts of the innerrotor.

3. In a rotary machine having inner and outer rotors eccentrlcallydisposed, said inner rotor having blades forming spaces for auxiliaryfluid and air or gases, a control cylinder at the inner ends of theblades of said inner rotor, divided in its circumferential portion inAtwo parts, one of said parts being for the inlet of the air or gases tobe compressed, and being stationary with respect to a part of the rotarymachine, the other part being of y annular shape, adapted to contactagainst a plurality of inner parts of the blades and movably disposedagainst said blades of the inner rotor, and having an opening for theoutlet of compressed air or gases coming from the spaces between theblades of the inner rotor, and means disposed between the first part andthe second part for pressing the second part away from the first partand against the innermost parts of the inner rotor.

4. In a rotary machine having inner and outer rotors eccentricallydisposed, inner rotor having blades forming spaces for said auxiliaryfluid and air or gases, a control cylinder at the inner ends of theblades of said inner rotor divided into its circumferential portion intwo parts, one of said parts being for the inlet of air or gases to becompressed, and being stationary with respect to a vpart of the rotarymachine, the other part being movable and of annular shape, said movablepart being adapted to press against a plurality of the rst part andagainst the innermost parts of the blades of the inner rotor.

v ERNST SEIBOLD.

GEORG HOPFENSBERGER.

